[Noisebridge-discuss] exercises in dB

[Michael Shiloh]

I'm teaching a Science of Sound class, and I want to give my students a 
variety of exercises using decibles in order to cement this important 
concept.

Examples might be:

A loudspeaker produces a Sound Pressure Level (SPL) of 115 dB at 1 meter 
distance with an input power of 1 Watt. What is the SPL at 6 meters?

This requires using (and understanding) the inverse square law and then 
calculating the reduction in SPL.

My textbook ("Master Handbook of Acoustics", Everest and Pohlman) has a 
few worked examples in the text but no unanswered exercises.

For my electronics class we use a great online resource 
(http://www.allaboutcircuits.com/ which I highly recommend) which has a 
series of worksheets. This was immensly useful to give students an 
opportunity to see exactly where they were having trouble.

Does anyone know of an online and suitably licensed collection of 
appropriate exercises?

Thanks,
Michael